Rotating Shaft Structure with Automatic Locking Mechanism

1. A rotating shaft structure with automatic locking mechanism comprising: a) an axial member having a shaft and a linking portion, the shaft has a connecting segment located on a free end thereof; b) a main frame having a frame plane and a connecting portion, the frame plane has a core hole; c) a friction disc; d) a connecting part connected to the frame plane; e) a cam member having a fastening part and a sliding part; f) at least one elastic body; and g) an end closure connected to the connecting segment of the shaft connected with a end enclosure and forming axial pressure to constrain the main frame, the friction disc, the connecting part, the cam member, and the at least one elastic body, wherein the shaft is sequentially inserted through the core hole of the upright frame plane of the main frame, the friction disc, the connecting part, the fastening part, the sliding part, the at least one elastic body, and the end closure; wherein outer and inner edges of adjacent surfaces of the fastening part and the sliding part are respectively provided with at least one wedge block and at least one wedge slot alternately so as to connect the fastening part and the sliding part together; wherein, when the axial member rotates in a first direction, the inclined plane of the wedge slot of the sliding part moves upward along the inclined plane of the wedge block and thus axially presses the elastic body thereby prompting the contact plane of the sliding part to rotate along the wedge blocks of the fastening part; wherein, when the axial member rotates in a second direction being opposite to the first direction, the at least one wedge slot of the sliding part moves to the at least one wedge block of the fastening part and, the elastic body pressing the at least one wedge slot to engage the at least one wedge block forming an automatic locking of butting joint.

2. The device according to claim 1 , further comprising a pivotal part having at least one axial hole and a connecting hole, the linking portion is insertingly engaged into the connecting hole on an end of the pivotal part.

3. The device according to claim 1 , wherein the connecting portion has at least one connecting hole for securing the connecting part to an object.

4. The device according to claim 1 , wherein the frame plane has a tenon slot, the connecting part has a tenon inserted into the tenon slot, the connecting part and the frame plane compressively gripping the friction disc therebetween.

5. The device according to claim 1 , wherein the connecting part has a tenon hole and the fastening part has a protruding tenon extending outwardly from a surface opposite the at least one wedge block, the protruding tenon being inserted into the tenon hole thereby connecting the connecting part and the fastening part.

6. The device according to claim 1 , wherein the frame plane has a tenon slot, the connecting part has a tenon and a tenon hole, the tenon of the connecting part is inserted into the tenon slot, the friction disc being compressively gripped between the connecting part and the frame plane, the fastening part has a protruding tenon extending outwardly from a surface opposite the at least one wedge block, the protruding tenon being inserted into the tenon hole of the connecting part thereby connecting the connecting part and the fastening part.

7. The device according to claim 1 , wherein the adjacent surfaces of each of the fastening part and the sliding part have oil holes positioned in a ring-like pattern and the friction disc has at least two oil holes.

8. The device according to claim 1 , wherein the elastic body is selected from a group consisting of a spring, a wave-like elastic disk, and a disc spring.

9. The device according to claim 1 , wherein the at least one wedge block of the fastening part includes three wedge blocks, and the at least one wedge slot of the sliding part includes three wedge slots.

10. The device according to claim 1 , further comprising a stop part having double stop edge contacts, the shaft being inserted through the stop part, the frame plane has a stop block spaced apart from the core hole of the main frame and located adjacent to the axial member, wherein one of the double stop edge contacts of the stop part selectively engaging the stop block and limiting an angle of movement.

11. The device according to claim 1 , further comprising a trigger having a protruding ear, the shaft being inserted through the trigger, the ear selectively contacting a control device when the protruding ear is rotated to a predetermined position.